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Overhead Ground Wires (OHGW) – A Practical View of Mechanical, Ageing and Electrical Aspects

Dates & Locations

Overview

Overhead Ground Wires (OHGW) provide lightning protection and distributed grounding important for safe operation of power lines. OHGW age faster than other overhead components such as  conductors, towers and foundations. This course is designed to provide a practical and introductory view of the fundamentals of the mechanical, ageing and electrical characteristics of OHGW. Participants will learn how conductor motion, such as galloping and sleet jump affects reliability. Test methods and field inspection techniques that characterize ageing of OHGW and their effectiveness for electrical protection will be demonstrated. Asset management of OHGW is more complicated than other components and best practices can include direct replacement, substitution of optical fibre ground wire or no replacement at all.

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Course Outline

Overhead Conductor Motion

  • Relative sag under ice loading
  • What is sleet jump?
  • What is galloping?
  • Field inspection and monitoring

Overhead Ground Wire Ageing

  • Degradation mechanisms
  • Laboratory testing 
  • Field testing
  • Lab demonstrations including: wind tunnel, galloping, torsional ductility testing, breaking strength testing
  • Lab tours including: Mechanical Test Laboratory, Conductor Dynamics Laboratory

Industry Standards

  • Introduction to applicable standards

Grounding 101

  • The Basics – Soil Characteristics
  • Foundations
  • Supplemental Ground Rods and Electrodes
  • Managing Flow of Power System Currents with OHGW
  • Managing Flow of Severe Lightning Currents with OHGW

Lightning 101

  • The Basics – Lightning occurrence
  • Lightning Interception
  • Managing Flow of Normal Lightning currents
  • Managing Electrical Problems from Severe Lightning

Replacement of OHGW Assets

  • Sampling Programs and End-of-Life Criteria  
  • Direct replacement
  • Substitution of optical fibre ground wire (OPGW)
  • No replacement using transmission line surge arresters (TLSA)

Who Should Attend

  • ​Mechanical and Civil Engineers, technologists and any others new to the area of transmission line engineering  
  • Conductor, OHGW and OPGW  Manufacturers

Key Benefits

  • ​Practical and theoretical skills and knowledge for engineers who are new to the field of electrical and mechanical layout of overhead lines and placement of OHGW
  • Identify the inspection techniques for aged overhead ground wires
  • Recognize ways to make OHGW more effective
  • Lab Demonstrations and Tours

Instructors

  • Craig Pon P.Eng


    Craig is the Manager of the Transmission Lines and Cables Department. He is Chair of the IEEE Conductors Working Group.​

  • Corine Dimnik P.Eng


    Corine is a mechanical engineer and a contributing member to the Fibre Optic Standards Working Group.​

  • Zsolt Peter Ph.D


    Zsolt is a mechanical engineer with a decade of experience and is a contributing member on ANSI C19 for overhead connectors and the IEEE Task Force on Std. 738. ​

Contact Training


Training Locations

  • Toronto

    800 Kipling Ave., Unit 2
    Toronto, Ontario, M8Z 5G5

    Map


    416-207-6000

    416-207-6532


  • Pickering

    940 Brock Road, Unit 11
    Pickering, Ontario, L1W 2A1

    Map


    905-420-4242

    905-420-4125



 

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